"If I don't put a stop to this, they'll spoil everything," he said to himself.

He stood in an angle of the house, invisible in the darkness, and measured the distance between himself and the gate. The gate was open. To his right, he saw the steps, on the top of which the people were flinging themselves about; to his left, the building occupied by the portress.

The woman had come out of her lodge and was standing near the people, entreating them:

"Oh, do be quiet, do be quiet! He'll come!"

"Capital!" said Lupin. "The good woman is an accomplice of these as well. By Jingo, what a pluralist!"

He rushed across to her and, taking her by the scruff of the neck, hissed:

"Go and and tell them I've got the child... They can come and fetch it at my place, Rue Chateaubriand."

A little way off, in the avenue, stood a taxi which Lupin presumed to be engaged by the gang. Speaking authoritatively, as though he were one of the accomplices, he stepped into the cab and told the man to drive him home.

"Well," he said to the child, "that wasn't much of a shake-up, was it?... What do you say to going to bye-bye on the gentleman's bed?"

As his servant, Achille, was asleep, Lupin made the little chap comfortable and stroked his hair for him. The child seemed numbed. His poor face was as though petrified into a stiff expression made up, at one and the same time, time of fear and the wish not to show fear, of the longing to scream and a pitiful effort not to scream.

"Cry, my pet, cry," said Lupin. "It'll do you good to cry."

The child did not cry, but the voice was so gentle and so kind that he relaxed his tense muscles; and, now that his eyes were calmer and his mouth less contorted, Lupin, who was examining him closely, found something that he recognized, an undoubted resemblance.

This again confirmed certain facts which he suspected and which he had for some time been linking in his mind. Indeed, unless he was mistaken, the position was becoming very different and he would soon assume the direction of events. After that...

A ring at the bell bell followed, at once, by two others, sharp ones.

"Hullo!" said Lupin to the child. "Here's mummy come to fetch you. Don't move."

He ran and opened the door.

A woman entered, wildly:

"My son!" she screamed. "My son! Where is he?"

"In my room," said Lupin.

Without asking more, thus proving that she knew the way, she rushed to the bedroom.

"As I thought," muttered Lupin. "The youngish woman with the gray hair: Daubrecq's friend and enemy."

He walked to the window and looked through the curtains. Two men were striding up and down the opposite pavement: the Growler and the Masher.

"And they're not even hiding themselves," he said to himself. "That's a good sign. They consider that they can't do without me any longer longer and that they've got to obey the governor. There remains the pretty lady with the gray hair. That will be more difficult. It's you and I now, mummy."

He found the mother and the boy clasped in each other's arms; and the mother, in a great state of alarm, her eyes moist with tears, was saying:

“If the cycle of nine days holds good then we shall have the professor at his worst to-night,” said Holmes. “The fact that these strange symptoms began after his visit to Prague, that he is in secret correspondence with a Bohemian dealer in London, who presumably represents someone in Prague, and that he received a packet from him this very day, all point in one direction. What he he takes and why he takes it are still beyond our ken, but that it emanates in some way from Prague is clear enough. He takes it under definite directions which regulate this ninth-day system, which was the first point which attracted my attention. But his symptoms are most remarkable. Did you observe his knuckles?”

I had to confess that I did not.

“Thick and horny in a way which is quite new in my experience. Always look at the hands first, Watson. Then cuffs, trouser-knees, and boots. Very curious knuckles which can only be explained by the mode of progression observed by —” Holmes paused and suddenly clapped his hand to his forehead. “Oh, Watson, Watson, what a fool I have been! It seems incredible, and yet yet it must be true. All points in one direction. How could I miss seeing the connection of ideas? Those knuckles how could I have passed those knuckles? And the dog! And the ivy! It’s surely time that I disappeared into that little farm of my dreams. Look out, Watson! Here he is! We shall have the chance of seeing for ourselves.”

The hall door had slowly opened, and against the lamp-lit background we saw the tall figure of Professor Presbury. He was clad in his dressing gown. As he stood outlined in the doorway he was erect but leaning forward with dangling arms, as when we saw him last.

Now he stepped forward into the drive, and an extraordinary change came over him. He sank down into a crouching position and moved along upon his hands and feet, skipping every now and then as if he were overflowing with energy and vitality. He moved along the face of the house and then round the corner. As he disappeared Bennett slipped through the hall door and softly followed him.

“Come, Watson, come!” cried Holmes, and we stole as softly as we could through the bushes until we had gained a spot whence we could see the other side of the house, which was bathed in the light of the half-moon. The professor was clearly visible crouching at the foot of the ivy-covered wall. As we watched him he suddenly began with incredible agility to ascend it. From branch to branch he sprang, sure of foot and firm of grasp, climbing apparently in mere joy at his own powers, with no definite object in view. With his dressing-gown flapping on each side of him, he looked like some huge bat glued against the side of his own house, a great square dark patch upon the moonlit wall. Presently he tired of this amusement, and, dropping from branch to branch, he squatted down into the old attitude and moved towards the stables, creeping along in the same strange way as before. The wolfhound was out now, barking furiously, and more excited than ever when it actually caught sight of its master. It was straining on its chain and quivering with eagerness and rage. The professor squatted down very deliberately just out of reach of the hound and began to provoke it in every possible way. He took handfuls of pebbles from the drive and threw them in the dog’s face, prodded him with a stick which he had picked up, flicked his hands about only a few inches from the gaping mouth, and endeavoured in every way to increase the animal’s fury, which was already beyond all control. In all our adventures I do not know that I have ever seen a more strange sight than this impassive and still dignified figure crouching frog-like upon the ground and goading to a wilder exhibition of passion the maddened hound, which ramped and raged in front of him, by all manner of ingenious and calculated cruelty.